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Viscoelastic-Viscoplastic Modelling of the Scratch Response of PMMA

Abstract : This paper aims at understanding how to model the time-dependent behavior of PMMA during a scratch loading at a constant speed and at middle strain levels. A brief experimental study is first presented, consisting of the analysis of microscratches carried out at various scratching velocities and normal loads. The loading conditions have been chosen in such a way that neither (visco) elasticity nor (visco) plasticity of the PMMA may be neglected a priori. The main analyzed parameter is the tip penetration depth measured during the steady state. Then, a finite element model is used to investigate the potential of classical elastic-viscoplastic constitutive models to reproduce these experimental results. It is mainly shown that these models lead to unsatisfying results. More specifically, it is pointed out here that the time-independent Young modulus used in such models is not suitable. To take into account this feature, a viscoelastic-viscoplastic model based on the connection in series of a viscoelastic part with a viscoplastic part is proposed. It is shown that it leads to more acceptable results, which points out the importance of viscoelasticity in the scratch behavior of solid polymers.
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Submitted on : Tuesday, December 10, 2019 - 11:07:41 AM
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Guillaume Kermouche, Nicolas Aleksy, Jean-Michel Bergheau. Viscoelastic-Viscoplastic Modelling of the Scratch Response of PMMA. Advances in Materials Science and Engineering, Hindawi Publishing Corporation, 2013, 2013, pp.article ID289698. ⟨10.1155/2013/289698⟩. ⟨emse-00942952⟩



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